Performance Variability: Do Peak Sun Hours Change Year to Year In The?

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Understanding Solar Variability in the Rockies Peak sun hours (PSH) in the Rockies can be affected by several factors, including cloud cover, temperature, and atmospheric conditions. According to data from the National Renewable Energy Laboratory (NREL), the average annual PSH in Colorado ranges from 180 to 220 hours, with a standard deviation of 15-20%. This variation can be attributed to changes in weather patterns, such as El Niño-Southern Oscillation (ENSO) events, which can impact solar irradiance.
Analyzing Year-to-Year Variability To better understand the year-to-year variability in PSH, let’s examine the data from a few select locations in the Rockies. For example, in 2018, the PSH in Aspen, Colorado was 204 hours, while in 2019 it was 186 hours - a difference of 18 hours. This fluctuation is not unusual, given the region’s dynamic weather patterns. To account for such variability, solar panel system designers often use a safety factor or derate their system’s expected performance to ensure it meets energy demands.
Mitigating Variability with Proper Design To mitigate the effects of PSH variability, solar panel system designers can use various techniques, such as:
Using a safety factor to account for expected PSH fluctuations Derating the system’s expected performance to ensure it meets energy demands Incorporating energy storage systems to supplement solar energy during periods of low PSH Opting for solar panels with high efficiency ratings to maximize energy production Conducting thorough site assessments to identify areas with the most favorable solar irradiance